American middle-distance runner Jonah Koech, the US 1500m champion, has been handed a three-year ban for blood doping. The suspension was announced by the relevant authorities, though no further details were provided. Koech, who competes in the 1500 meters, is one of the country's top middle-distance talents. The ban effectively sidelines him from competition for three years, a significant setback to his career. Blood doping is a prohibited method used to enhance athletic performance by increasing the oxygen-carrying capacity of the blood. The case adds to a growing list of track and field athletes sanctioned for doping violations. No additional information about the timing of the ban or the circumstances of the violation was disclosed.